Cylinder ridge reamer



March 29, 1949. H. A. BERKMAN CYLINDER RIDGE REAMER 2 Sheets-Sheet 1Filed Nov. 20, 1947 fiderzZ arf M MM, 3 Wqff jl' i offi y' March 29,1949. H. A. BERKMAN CYLINDER RIDGE REAMER 2 Sheets-Sheet 2 Filed NOV.20, 1947 Patented Mar. 29, 1949 CYLINDER RIDGE REAMER Herbert A.Berkman, Chicago, Ill., assignor to Zim Manufacturing Company, acorporation of Illinois Application November 20, 1947, Serial No.787,151

10 Claims. 0]. 77-43) In my prior application, now Patent Number2,452,095, there is disclosed a -reamer to remove internal ridges at theupper ends of internal combustion engine cylinders, by means of acutting tool that is automatically fed lengthwise of a cylinder whilebeing rotated about the axis of the latter. The present inventionrelates to a tool of that type, and it has for its primary object toimprove the same to increase its efllciency and to make it easier tomount the tool in a cylinder ready for a reaming operation.

In the reamer forming the subject of my aforesaid application theautomatic feed of the cutting blade is caused by a screw shaft providedwith a star wheel that is turned step by step as the blade support isrevolved around the axis of the cylinder; the star wheel engaging astationary pin once during each revolution of the blade support. In myprior reamer this pin lies on the side of the star wheel nearest theaxis of the tool on an expansible means adapted to secure the toolwithin a cylinder. registering the star wheel with the pin beforespreading the expanding means to press against the surrounding cylinderwall, the subsequent spreading action of such means serves to push thestar wheel radially and thus shift the cutting blade in the samedirection. If the pin be placed in the outer side of the star wheel,instead of 1 on the inner side, the length of the path through which thepin may travel (for a given angular movement), increases and smoothturning of the wheel results. is made, the pin can no longer serve tomove the star wheel radially in the outward direction One of the objectsof the present invention is to produce a simple and novel constructionwherein the star wheel may lie inwardly from the actuating pin and yetbe automatically adjusted in the radial direction upon the spreading ofthe expansible means to secure the tool in a cylinder.

In order that the blade support may be adjusted automatically when. theexpansible securing means is expanded, the star wheel must first beregistered with the actuating pin and then be held in that positionwhile the expansion is taking place. My prior reamer requires the'use ofone of the hands of the operator for'this pur- Therefore, by

However, when such a change pose and complicates the process of mountingthe tool in a cylinder.

A further object of the present invention is to make it possible easilyto lock the parts with the star wheel and the actuating pin engagingeach other, before mounting the tool in a cylinder, and just as easilyto unlock them again after the mounting has been effected.

In tools of the type under consideration the tool support is mounted ona disc or table, associated with the expansible means, for slidablemovements in a radial direction; the tool support being locked againstmovement relative to such disc or table during a reaming operation,

but being loosened for initially adjusting the cutting blade in acylinder.

One of the objects of the present invention is to produce a simple andnovel locking means for the tool support to the table.

In my said prior reamer the blade support includes a second discoverlying and in permanent coaxial relation to the first disc or table,to

gether with a plate slidable radially of the discs and provided withmeans to carry the blade; a

screw device being provided to lock the plate or slide to the seconddisc.

A further object of the present invention is to produce a simple andnovel construction whereby the means for locking together the disc andslidable plate members of the blade holder serves also to lock the bladeholder to the stationary disc or table with the star wheel and theactuating pin therefor in registration with each other.

The various features of novelty whereby the present invention ischaracterized will hereinafter he pointed out with particularity in theclaims, but, for a full understanding of the invention and of itsobjects and advantages, referfor the movable blade supporting means;Fig. 5 is a section on line 5-5 of Fig. 1; Fig. 6 is a section on line6-6 of Fig. 2; Fig. 7 is a section on line 1-! of Fig. 5, but on alarger scale; Fig. 8 is a section on line 88 of Fig. 1, also on a largerscale; and Figs. 9 and 10 are perspective views of the cutting blade andits immediate support, respectively.

In the drawings the general construction of the tool is the same as inmy said prior application, namely: a round table I provided with acentral, upright, tubular stem 2; a long bolt 3 extends through the stemand table into screwthreaded engagement with a spider d below the table;flat shoes 5 are distributed about and cooperate with the spider to formtherewith an expansible means to clamp the table firmly within an enginecylinder A; a disc 6, almost as large in diameter as: the table overliesthe latter and has thereon a v hub 'I of polygonal exterior surroundingthe stem,

with the head 8 of the bolt resting on top of the stem and overlappingthe hub; a plate I0, slotted for the reception of hub I, overlies and isslidable on disc 6, and adjustably secured thereto bya screw IIextending through a long slot I2 in the plate and into the disc; arod-like handle I3 rises from the plate at a point remote from hub l;and a sturdy arm I4 overlies plate ill and is connected thereto by ahinge pin I5; a spring I6, behind the free end of arm I4, tendsconstantly to swing that end of the arm outwardly; a cam device I'I,positioned on the front or outer side of the free end of the arm, servesto press the, arm back against the resistance, of the spring; and tallpost or column I8 rises, from the arm I4 about midway between the endsof the latter for. carrying the cutting means.

0f the elements just described, only the screw I I and the post I8differ materially from the cor-I responding elements in my said priorreamer.

In the present construction, the post I8 is rectangular in cross sectionand has in the front or outermost side a recess I9 of such dimensions asto give the post the appearance of a long, narrow, deep, rectangular boxstanding on end; thin sections 2!} and ZI, forming the end walls of thebox, bounding the recess at the top and bottom of the post,respectively. Fitted slidablyl in recessIQ is a block 22 much shorterthan the vertical dimension of the recess. In the outer or front face ofthe block is a deep groove or channel 23 that extends throughout thelength of the block. In this groove or channel is a flat cutter blade24, shown as being held in place, by a screwthreaded pin 25; the pinbeing entered through one side of the block, passing through a hole 28in thelolade and being screwed into that part of the block on the otherside of the blade The pin has a few screwthreads 21 at the inner endthereof and is smooth throughout the remainder of its length to providea bearing on which the blade may rock. v

A screw shaft 28 extends throughout thelengthd 0f the post and throughascrewthreaded passage:

29 extending vertically through the block behind. the groove or channel23. On the upper end of. this shaft is a head andon the lower end, belowwall section 2! of the post, is a star wheel 30, by which the-shaftis-kept in place. An upper. section 28 of the shaft, at least as long asthe block 22, is left blank so that, when the block is raised to apredetermined upper limit, the screwthreaded connection with the shaftis interrupted. This prevents the workman from forcibly raising theblock sohigh that something is apt to break.

4 As in my aforesaid prior reamer, the star wheel is turned step bystep, as disc '6, with the parts mounted thereon, is rotated in theusual way; a

pin 3| being fixed to and rising from the upper 5 end of one of theshoes 5 and extending up through a radial slot 32 in table I, into whichslot the upper end of that shoe projects.

In accordance with the present invention, the pin lies outwardly fromthe circular path which the center of the star wheel travels during theturning of disc 6; the outwardly directed arms of the star wheel, oneafter another and only one during each revolution of the disc, strikingthe pin during a reaming operation. The screw shaft 15 turns with thestar wheel and, therefore, the blade ,carrying block 22 is moved upslowly, step by step,

as disc 6 keeps on turning.

The distance of the pin 3I from the axis of the reamer depends on thediameter of the cylinder within which the reamer is secured, as doesalso the distance of the cutting edge of the blade from that axis.Therefore, in order to effect automatic adjustment of the bladewhen thereamer is secured in place, I provide the lower wall 2I on post I8 witha depending lip 33 that lies outwardly fromthe pin during normaloperation of the tool. When the reamer is to be insertedin a cylinder,the disc 6 is turned until lip 33 regis ters with the pin. Thereupon,when the shoes 5 are spread to cause them to be thrust against.v

a surrounding cylinder wall, the pin, acting on said lip, pulls slide)along with it; the slide.

having been unlocked beforehand. .The slide need then only be locked todisc 6 again to retain.

of course, that the-blade isheld back by cam de-' vice I1 so as not totouch the cylinder wall until the securing of the tool in the cylinderis com;

pleted; after which spring I6 is. permitted to swing arm I4 and theblade outwardly.

In order to get the full advantage of matic adjustment just described,it is necessary that looking and unlocking the slide and hold'- 4 5, ingdisc 6 against turning relatively to the ex pansible, clamp means, whilethe reamer is being, mounted in a cylinder, bemadesimple and easy.This'I accomplish with screw II.

screwthreaded lower part I I and an upper part I I in the form of adeep'cup open at the top.

The upper part is somewhat larger in diameter than the lower part sothat, as shown in Fig. 8,- 655 the former serves 'as the screw head tobear on the upper side'of slide I8 when the screw tightened. A washer 34may be interposed be-v tween the slide and part II. Part N of thescrewhas an axial bore '35, smaller in diameter-l 69,, than the 'borein' partII, extending'througl'r' the same. In-the-cup shaped part of the screw 1isa plunger 36 that terminates in a part or stem 1 Slot reduced diameterwhich extends down through bore '35. Onthe u'pperend-of the plung:

aiis. a head 38 provided with'a kerf 39'to receive a screw driver.Between the-under side of this-: head and the top of the screw II is acompres sion spring 48. In table I is a hole M at the sameradial'distance-from the axis of the tool as is the screw hole 42 indisc 6; The parts are so proportioned'that' when the disc 6 is turned"until stem 1 registers with hole 4|, the plunger device may be pusheddown far enough to causethe stem to enter that hole and thereby lock 76disc 6 tc-the table; In thecylindrical wall of,

the auto with means associated It will be seen that screw II comprises athe cup-shaped part of screw II is an L-shaped slot 43. On plunger 36 isa radial pin 44 that extends into the slot.

When the pin 44 is in the vertical arm of the slot, the spring normallyholds the plunger device raised, as in Fig. 8, with its lower end clearof table I. With stem 3'! and hole 4| in registration, the plungerdevice may be pressed down until the stem enters that hole; and, by thenturning the plunger device, the pin 44 enters the horizontal arm of slot43, locking the plunger device in its down position and the disc 6against rotation relative to the table. When the parts are in thepositions shown in Fig. 8, the screw may be turned in either direction,thus permitting the slide In to be fixed to disc 6 or be left free toslide back and forth on the latter.

Assuming that in Fig. 8 the screw has been tightened, and that thereamer is to be inserted in a cylinder: the rotary unit is turned, ifnot already in the proper position, until stem 31 registers with hole 4|in the table; a screw driver is then applied to the kerf in head 38 andis pressed down until pin 44 reaches the lower end of the vertical armof slot 43, driving the stem into hole 4|. The screw driver is thenturned to carry the pin into the horizontal arm of the L slot. Thislooks the plunger down and, by continuing the movement of the screwdriver, the pin reaches the closed end of the horizontal arm of the slotand thereafter turns the screw in the unscrewing direction. This finalturning movement unlocks the slide without raising stem 31 out of hole4|. Consequently the tool is now ready for insertion in a cylinder. Ifthe expansible means requires to be contracted for entry into thecylinder, the bolt 8 is turned to draw the shoes 5 inward; the slidebeing carried along with the shoes because pin 33 is engaged with thestar wheel. The tool having been lowered into the cylinder, bolt 3 isagain turned, this time in the direction to spread the shoes and clampthe reamer to the cylinder; the cutting blade being simultaneouslycarried into proximity to the cylinder wall. All that then need be donebefore actual reaming is started, is to unlock disc 6 and again lock theslide to the latter. This is accomplished by turning the plunger deviceback to bring pin 44 into registration with the vertical arm of the Lslot. This again tightens the screw and allows the stem to be lifted outof hole 4|. Cam device I1 is then turned to allow spring l6 to swing arm|4 out until the blade contacts the cylinder wall.

In order that the blade may be inserted or removed without disturbingblock 22 in which it is mounted, one of the side walls of post l8 has inits edge a notch 45, best seen in Fig. 5, that registers with screw whenthe block 22 is at the upper limit of its movement. A screw driver maytherefore be applied to screw 25 either to introduce or remove the samethrough notch 45; the blade being held in place only by the screw andbeing therefore removable and replaceable at will.

While I have illustrated and described with particularity only a singlepreferred form of my invention, I do not desire to be limited to theexact details thus illustrated and described, but

a rotatable member, expansible means connected with the table to securethe same in an engine cylinder, an element mounted on said rotatablemember for adjustment radially of the axis of rotation; a cutterassembly on said element including a star wheel positioned above andnear a radially movable part of said expansible means, and a dependinglipoutwardly from and near said wheel; and a pin extending upwardly fromsaid radially movable part for engagement with the outer side of thestar wheel to turn it when said rotatable member revolves, and to engagewith the inner side of said lip to shift said element when saidexpansible means expands.

2. A cylinder reamer as set forth in claim 1 having, in addition, ameans to secure said rotatable member temporarily to the table againstrelative rotary movements.

3. A cylinder reamer as set forth in claim 1, in

\ eluding cooperating lock elements on the table and the rotary memberfor locking the latter together only when such parts register with eachother, and the lock element on the rotary member being so positionedthat it registers with the lock element on the table only when the starwheel and its actuating pin register with each other.

4. A cylinder as set forth in claim 1, wherein the table contains ahole, and wherein there is included a movable part adapted to be enteredin said hole to lock the rotatable member against rotation relatively tothe table, said movable part being so located that it registers with thehole only when the star wheel and the actuating pin therefor registerwith each other.

5. In a cylinder reamer, a table having thereon a rotatable member,expansible means connected with the table to secure the same in anengine cylinder, a slide mounted on the said member for movement atright angles to the axis of revolution,

, a screw and slot connection between the slide and the rotatable memberto hold them against relative movements when the screw is tight, saidtable containing a hole that registers with said screw in apredetermined angular position of the rotary member, and a device on thescrew and movable thereon into and out of the said hole when the latterregisters with the screw.

In a cylinder reamer, a table having thereon a rotatable member,expansible means connected with the table to secure the same in anengine cylinder, a slide mounted on the said member for movements atright angles to the axis of revolution, a screw and slot connectionbetween the slide and the rotatable member to hold them against relativemovements when the screw is tight, said table containing a hole thatregisters with said screw in a predetermined angular position of therotary member, said screw containing an axial bore extending throughoutthe length of the same, a screw-actuating plunger device positioned insaid bore and shaped at its lower end for entry into the hole in thetable, the upper part of the screw having in its annular wall anL-shaped slot, a pin on the plunger projecting into said slot, and aspring tending constantly to move the plunger device up until the pinreaches the upper end of the slot, the length of the vertical arm of theslot being such that when the plunger device is up it is clear of thetable.

'7. A cylinder reamer as set forth in claim 6,

wherein the hand of the thread is such that when the plunger device isturned in the direction to carry the pin into the horizontal arm of theslot, should they be registering, the screw will be loosened.

enema! 8. A cylinder reamer as set forth in claim 6,

wherein the hand of the thread is such that when r the plunger device isturned in the direction to carry the pin into the horizontal arm of theslot, should they be registering, the screw will be loosened, andwherein the lower end of the plunger device and the table, when saiddevice is up, is less than the distance which said pin must travel tomove down into registration with the horizontal arm of the slot.

9. A cylinder reamer as set forth in claim 6, wherein the spring restson the upper end of the screw and the plunger device is provided with ahead that rests on the spring and by means of which the plunger deviceis rotated.

10. In a cylinder reamer, a table having thereon a rotatable member,expansible means connected with the table to secure the same in anengine cylinder, a slide mounted on said member for movements at rightangles to the axis of revolution, a support for a blade on one end ofsaid slide, means including a star wheel to move said support, a pin onsaid expansible means for engagement with said wheel when said member isrevolved, a lip on said end of the slide located outwardly from the starwheel in positonlto be engaged by said pin to move the slide when theexpansible means is expanded while the rotatable member is apredetermined angular position on the table, said table having a smallhole therein, and a movable element mounted on the rotatable member sothat it may be entered into said hole when said member is in saidpredetermined position. I

' HERBERT A. BERKMAN.

REFERENCES CITED The following references are of record in thefileofthis patent:

UNITED STATES PATENTS Berkman Nov.'.8 1938

